{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-72083", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.904Z", "datePublished": "2026-08-15T05:52:32.045Z", "dateUpdated": "2026-08-17T05:40:05.325Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:40:05.325Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: core: Fix iSCSI ISID use-after-free in REGISTER AND MOVE\n\ncore_scsi3_emulate_pro_register_and_move() maps the PERSISTENT RESERVE OUT\nparameter list with transport_kmap_data_sg() and parses the destination\nTransportID with target_parse_pr_out_transport_id(). For an iSCSI\nTransportID (FORMAT CODE 01b), iscsi_parse_pr_out_transport_id() returns\nthe ISID in iport_ptr as a raw pointer into that mapped buffer.\n\nThe function then unmaps the buffer with transport_kunmap_data_sg() before\ndereferencing iport_ptr in strcmp(), __core_scsi3_locate_pr_reg() and\ncore_scsi3_alloc_registration(). When the parameter list spans more than\none page (PARAMETER LIST LENGTH > 4096), transport_kmap_data_sg() uses\nvmap() and transport_kunmap_data_sg() does vunmap(), so the kernel virtual\naddress backing iport_ptr is torn down and every subsequent dereference is\na use-after-free read of the unmapped region.\n\nKeep the parameter list mapped until iport_ptr is no longer needed: drop\nthe early transport_kunmap_data_sg() and unmap once on the success path,\nright before returning. The error paths already unmap through the existing\n\"if (buf) transport_kunmap_data_sg(cmd)\" at the out: label, which now runs\non every post-map error exit because buf is no longer cleared early. Only\nreads of the mapping happen while spinlocks are held; the map and unmap\ncalls remain outside any lock. The sibling caller\ncore_scsi3_decode_spec_i_port() already uses the buffer before unmapping it\nand is left unchanged."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - On LIO/iSCSI storage servers and appliances, a remote initiator sends PERSISTENT_RESERVE_OUT with REGISTER AND MOVE over TCP (port 3260); iscsit_process_scsi_cmd()\u2192target_execute_cmd()\u2192target_scsi3_emulate_pr_out()\u2192core_scsi3_emulate_pro_register_and_move() with no local access required.\nAC:L - The attacker fully controls the PR-OUT parameter list length (>4096 to force vmap/vunmap), iSCSI TransportID format 01b with ISID, and can establish prerequisite PR registration and reservation via prior SCSI commands on the same session; no uncontrollable race or layout dependency exists.\nPR:N - Exploitation requires only the ability to act as a network SCSI/iSCSI client with LUN access to an exported target; no Linux UID, capability, or init-namespace root on the storage server is needed\u2014only standard iSCSI initiator connectivity (CHAP/ACL when configured).\nUI:N - Triggering is fully automated once an iSCSI session exists: the attacker issues scripted REGISTER, RESERVE, then REGISTER AND MOVE commands with a crafted >4 KiB parameter list; no victim mount, click, or other interactive action is required.\nS:U - The UAF corrupts kernel heap state inside the target-core PR handler on the storage host; impact stays within that kernel security domain and does not inherently cross VM, container, or IOMMU boundaries (standard host compromise, not escape).\nC:H - After vunmap(), iport_ptr aliases freed kernel virtual address space and is dereferenced in strcmp(), __core_scsi3_locate_pr_reg(), and snprintf() into pr_reg_isid; per kernel CVSS guidance, UAF reads enable arbitrary kernel memory disclosure when uncertain.\nI:H - UAF reads of attacker-influenced unmapped PR-OUT data drive strcmp-based registration matching and snprintf copies into persistent kernel pr_reg structures; memory corruption/UAF is scored High for integrity because it can be leveraged for control-flow or state manipulation.\nA:H - Dereferencing iport_ptr after transport_kunmap_data_sg() vunmap() on multi-page buffers causes immediate invalid kernel virtual address accesses (oops/panic) on every qualifying REGISTER AND MOVE; UAF availability impact is High per kernel guidance even before full exploit development."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/target/target_core_pr.c"], "versions": [{"version": "4949314c7283ea4f9ade182ca599583b89f7edd6", "lessThan": "7d56f5c868d92c9d504a34a3ea450bce481c7f63", "status": "affected", "versionType": "git"}, {"version": "4949314c7283ea4f9ade182ca599583b89f7edd6", "lessThan": "59a2a5a37dc49a641ad6bc64aee34e5a61025ffd", "status": "affected", "versionType": "git"}, {"version": "4949314c7283ea4f9ade182ca599583b89f7edd6", "lessThan": "9f8076cc73dfa6b10155978c160587e986b22169", "status": "affected", "versionType": "git"}, {"version": "4949314c7283ea4f9ade182ca599583b89f7edd6", "lessThan": "a040004846f1fbe687f6ec76d9ccc27b4ead42e4", "status": "affected", "versionType": "git"}, {"version": "4949314c7283ea4f9ade182ca599583b89f7edd6", "lessThan": "05b3e37433cf2eaf8867f1c16528aa347bb212ab", "status": "affected", "versionType": "git"}, {"version": "4949314c7283ea4f9ade182ca599583b89f7edd6", "lessThan": "cb7bdae7fba404852ade34b0c1445fbaf3e54fbb", "status": "affected", "versionType": "git"}, {"version": "4949314c7283ea4f9ade182ca599583b89f7edd6", "lessThan": "ef2ee18fec92088c7d8877baf7674e89389ccd66", "status": "affected", "versionType": "git"}, {"version": "4949314c7283ea4f9ade182ca599583b89f7edd6", "lessThan": "fda6a1f3c3d7047b5ce5654487649c2daa738bfc", "status": "affected", "versionType": "git"}, {"version": "d2227f84ba0e97906153ac83db13213fb2e3938d", "status": "affected", "versionType": "git"}, {"version": "3.2.9", "lessThan": "3.3", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/target/target_core_pr.c"], "versions": [{"version": "3.3", "status": "affected"}, {"version": "0", "lessThan": "3.3", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "5.10.261"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "5.15.212"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "6.1.178"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "6.6.145"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "7.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2.9"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/7d56f5c868d92c9d504a34a3ea450bce481c7f63"}, {"url": "https://git.kernel.org/stable/c/59a2a5a37dc49a641ad6bc64aee34e5a61025ffd"}, {"url": "https://git.kernel.org/stable/c/9f8076cc73dfa6b10155978c160587e986b22169"}, {"url": "https://git.kernel.org/stable/c/a040004846f1fbe687f6ec76d9ccc27b4ead42e4"}, {"url": "https://git.kernel.org/stable/c/05b3e37433cf2eaf8867f1c16528aa347bb212ab"}, {"url": "https://git.kernel.org/stable/c/cb7bdae7fba404852ade34b0c1445fbaf3e54fbb"}, {"url": "https://git.kernel.org/stable/c/ef2ee18fec92088c7d8877baf7674e89389ccd66"}, {"url": "https://git.kernel.org/stable/c/fda6a1f3c3d7047b5ce5654487649c2daa738bfc"}], "title": "scsi: target: core: Fix iSCSI ISID use-after-free in REGISTER AND MOVE", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/target/target_core_pr.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "7d56f5c868d92c9d504a34a3ea450bce481c7f63", "status": "affected", "version": "4949314c7283ea4f9ade182ca599583b89f7edd6", "versionType": "git"}, {"lessThan": "59a2a5a37dc49a641ad6bc64aee34e5a61025ffd", "status": "affected", "version": "4949314c7283ea4f9ade182ca599583b89f7edd6", "versionType": "git"}, {"lessThan": "9f8076cc73dfa6b10155978c160587e986b22169", "status": "affected", "version": "4949314c7283ea4f9ade182ca599583b89f7edd6", "versionType": "git"}, {"lessThan": "a040004846f1fbe687f6ec76d9ccc27b4ead42e4", "status": "affected", "version": "4949314c7283ea4f9ade182ca599583b89f7edd6", "versionType": "git"}, {"lessThan": "05b3e37433cf2eaf8867f1c16528aa347bb212ab", "status": "affected", "version": "4949314c7283ea4f9ade182ca599583b89f7edd6", "versionType": "git"}, {"lessThan": "cb7bdae7fba404852ade34b0c1445fbaf3e54fbb", "status": "affected", "version": "4949314c7283ea4f9ade182ca599583b89f7edd6", "versionType": "git"}, {"lessThan": "ef2ee18fec92088c7d8877baf7674e89389ccd66", "status": "affected", "version": "4949314c7283ea4f9ade182ca599583b89f7edd6", "versionType": "git"}, {"lessThan": "fda6a1f3c3d7047b5ce5654487649c2daa738bfc", "status": "affected", "version": "4949314c7283ea4f9ade182ca599583b89f7edd6", "versionType": "git"}, {"status": "affected", "version": "d2227f84ba0e97906153ac83db13213fb2e3938d", "versionType": "git"}, {"lessThan": "3.3", "status": "affected", "version": "3.2.9", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/target/target_core_pr.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "3.3"}, {"lessThan": "3.3", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.261", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.212", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.178", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.145", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.97", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.40", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: core: Fix iSCSI ISID use-after-free in REGISTER AND MOVE\n\ncore_scsi3_emulate_pro_register_and_move() maps the PERSISTENT RESERVE OUT\nparameter list with transport_kmap_data_sg() and parses the destination\nTransportID with target_parse_pr_out_transport_id(). For an iSCSI\nTransportID (FORMAT CODE 01b), iscsi_parse_pr_out_transport_id() returns\nthe ISID in iport_ptr as a raw pointer into that mapped buffer.\n\nThe function then unmaps the buffer with transport_kunmap_data_sg() before\ndereferencing iport_ptr in strcmp(), __core_scsi3_locate_pr_reg() and\ncore_scsi3_alloc_registration(). When the parameter list spans more than\none page (PARAMETER LIST LENGTH > 4096), transport_kmap_data_sg() uses\nvmap() and transport_kunmap_data_sg() does vunmap(), so the kernel virtual\naddress backing iport_ptr is torn down and every subsequent dereference is\na use-after-free read of the unmapped region.\n\nKeep the parameter list mapped until iport_ptr is no longer needed: drop\nthe early transport_kunmap_data_sg() and unmap once on the success path,\nright before returning. The error paths already unmap through the existing\n\"if (buf) transport_kunmap_data_sg(cmd)\" at the out: label, which now runs\non every post-map error exit because buf is no longer cleared early. Only\nreads of the mapping happen while spinlocks are held; the map and unmap\ncalls remain outside any lock. The sibling caller\ncore_scsi3_decode_spec_i_port() already uses the buffer before unmapping it\nand is left unchanged."}], "id": "CVE-2026-72083", "lastModified": "2026-08-17T06:18:07.043", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-08-15T06:21:20.167", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/05b3e37433cf2eaf8867f1c16528aa347bb212ab"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/59a2a5a37dc49a641ad6bc64aee34e5a61025ffd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7d56f5c868d92c9d504a34a3ea450bce481c7f63"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9f8076cc73dfa6b10155978c160587e986b22169"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a040004846f1fbe687f6ec76d9ccc27b4ead42e4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cb7bdae7fba404852ade34b0c1445fbaf3e54fbb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ef2ee18fec92088c7d8877baf7674e89389ccd66"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fda6a1f3c3d7047b5ce5654487649c2daa738bfc"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: scsi: target: core: Fix iSCSI ISID use-after-free in REGISTER AND MOVE", "id": "2516579", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516579"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in the Linux kernel's iSCSI target core. This use-after-free vulnerability occurs in the `core_scsi3_emulate_pro_register_and_move()` function. When processing iSCSI TransportIDs, a memory buffer is prematurely unmapped while still being referenced, particularly when the parameter list spans multiple pages. An attacker could potentially exploit this to cause a system crash, leading to a denial of service."], "name": "CVE-2026-72083", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-72083\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-72083\nhttps://lore.kernel.org/linux-cve-announce/2026081521-CVE-2026-72083-e7ac@gregkh/T"], "threat_severity": "Important"}